This is Version 3.2 of MYMBAK.EXE, a self-extracting file which includes a procedure for running a DOS version of MYM, and then backing up your MYM data in a rotating set of up to 20 compressed backups.
It also includes a procedure for restoring the data if necessary. The procedures may be run directly under DOS or in a DOS window in any version of Microsoft Windows.
You must have zip/unzip programs compatible with PKZIP/PKUNZIP to use them. Be sure to read MYMBAK.TXT, which describes necessary setup. V3.2 cautions against use of Info-Zip's programs and updates documentation.